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随着精确制导技术的快速发展，对两个波段的辐射同时进行探测已显得非常重要，对应的光学系统及其设计需求空前增长。文中根据谐衍射透镜的消色差、消热差特性，在各个较低衍射级次上的共焦以及极高衍射效率的特性，在现有金刚石切削加工能力的条件下应用CODEV光学设计软件设计了适用于-45~+71益的共轴双波段红外光学系统，该系统在全温度范围内无需调焦其调制传递函数全部接近衍射极限，光学系统无渐晕，并且达到100%冷光阑效率。该红外双波段光学系统结构紧凑、片数少、透射比高，对于提高导引头的探测精度、识别能力、打击精度有质的飞跃。“,”With the rapid development of precision guidance technology, simultaneous detection of both bands has become very important, the demand of the corresponding optical system and its design increase rapidly. According to the harmonic diffraction element with the characteristic of achromatism, athermalization, same focus on each low diffractive level and high diffractive efficiency, using the CODEV optical design program, a coaxial dual-band IR optical system was designed that worked at -45~+71℃ in the existing processing conditions of diamond cutting. The modulation transfer function (MTF) approached to the diffraction limit in the whole range of temperature and no need to focus, there was no vignetting in optical system and the efficiency of cold shield reached 100%. The dual band infrared optical system has the advantages of compact structure, fewer elements and high transmittance, it is a qualitative leap for improving detection accuracy and recognition ability of the seeker.